This chapter discuss the used of files and databases together to build PHP applications.
Chapter example: Guitar War web site that maintain users' high scores and validates it. It needs to be able to handle a image upload.
Things learned:
SQL commands
ADD COLUMN - add a new column to the table
DROP COLUMN - remove a column from a table
CHANGE COLUMN - change the name and/or data type of a column
MODIFY COLUMN - changes the data type or position of the column in a table
$_FILES - this is another superglobal variable that provides access to information about uploaded files.
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